mwoffliner Correctly rewrite / block iframes to external content

It looks like iframes are not rewritten at all currently in mwoffliner. We should.

See https://github.com/openzim/zim-requests/issues/1471#issuecomment-3043489876

This iframe comes from the Wikitext itself:

Jul 07 '25 08:07 benoit74

@kelson42 shall we consider for the time being that simply removing all iframes is fine? I feel like having a logic to detect if target of iframe is going to work or not inside the ZIM is not going to be worth it. From my understanding, iframe are rare in Mediawiki, and I'm quite sure most of them are not going to work inside the ZIM.

Sep 15 '25 15:09 benoit74

Just removing all iframes seems like the best solution to me as well.

Sep 15 '25 15:09 Markus-Rost

Handling properly iframe is goingto be challenging IMHO. Therefore I agree to (1) Remove them for the time being as workaround (2) keep this issue open to try to handle that properly in the future (postponing)

Oct 02 '25 10:10 kelson42

Postponing this issue to 2.0.0 then ; removal of iframe as a temporary workaround is now tracked in https://github.com/openzim/mwoffliner/issues/2537

Oct 02 '25 10:10 benoit74